National Instruments Low-Cost Multifunction I/O Board for ISA Lab-PC+ - Manual (Page 82)

© National Instruments Corporation A-1 Lab-PC+ User Manual
Appendix A
Specifications
This appendix lists the specifications of the Lab-PC+. These specifications are typical at 25
°
C
unless otherwise stated. The operating temperature range is 0
°
to 70
°
C.
Analog Input
Input Characteristics
Number of channels ......................................
8 single-ended, 4 differential
Type of ADC................................................. Successive approximation
Resolution ..................................................... 12 bits, 1 in 4,096
Maximum sampling rate ............................... 83 ksamples/s
Input signal ranges ........................................
Board Gain
(Software
Board Range
(Jumper Selectable)
Selectable) bipolar unipolar
1
±
5 V 0 to 10 V
2
±
2.5 V 0 to 5 V
5
±
1 V 0 to 2 V
10
±
0.5 V 0 to 1 V
20
±
0.25 V 0 to 0.5 V
50
±
0.1 V 0 to 0.2 V
100
±
0.05 V 0 to 0.1 V
Input coupling ............................................... DC
Overvoltage protection..................................
±
45 V powered on,
±
45 V powered off
Inputs protected ....................................... ACH<0..7>
FIFO buffer size ............................................ 512 samples
Data transfers ................................................ DMA, interrupts, programmed I/O
DMA modes .................................................. Single transfer
Transfer Characteristics
Relative accuracy ..........................................
±
1.0 LSB typ,
±
1.5 LSB max
DNL ..............................................................
±
0.5 LSB typ,
±
1 LSB max
No missing codes .......................................... 12 bits, guaranteed
Offset error
Pregain error after calibration ................. Adjustable to 0 V
Postgain error after calibration................ Adjustable to 0 V
Gain error (relative to calibration reference)
After calibration ...................................... Adjustable to 0%
Before calibration....................................
±
0.76% of reading (7,600 ppm) max
Gain
≠
1 with gain error
adjusted to 0 at gain = 1 ........................
±
0.5% of reading (500 ppm) max